Water cooled waveguide load



Feb. 13, 1968 R. A. CAMPBELL ETAl. 3,369,198

WATER COOLED WAVEGUIDE LOAD Filed Oct. 21, 1965 Richard A. CampbellCharles W. Corruthers,

INVENTORS.

hi /M BY M73. #1117 United States Patent 3,369,198 WATER COOLEDWAVEGUIDE LOAD Richard A. Campbell, West Concord, and Charles W.Carruthers, Burlington, Mass., assiguors, by mesne assignments, to theUnited States of America as represented by the Secretary of the ArmyFiled Oct. 21, 1965, Ser. No. 500,451 1 Claim. (Cl. 33322) Thisinvention relates to waveguides that are water cooled to reduce thetemperature thereof and to increase the power handling cap abilitiesthereof.

High power microwave waveguide loads are normally air cooled, with orwithout fins, or water cooled by an external water jacket or waterfilled glass tubes inside the waveguide. The existing air cooledwaveguides are fairly simple and light in construction, but powerhandling capabilities are very limited. The above noted water cooledwaveguides are heavy and complex in construction and are thus notcompletely satisfactory. Therefore, a simple and light weight watercooled waveguide is greatly needed.

With this need in mind, it is an object of this invention to provide asimple and light weight water cooled Waveguide.

Another object of this invention is to provide a Water coolingarrangement that can be added to existing air cooled waveguides.

A further object of this invention is to provide a water cooledwaveguide that is rugged in construction yet very low in cost.

Still another object of this invention is to conduct heat away from thewaveguide in the circulated water rather than heating the ambient air.

In accordance with this invention, a water cooled waveguide load isprovided in which copper or aluminum tubing is wound about the outerperiphery of the waveguide and secured to the waveguide such as bysoldering to the outer surfaces of the waveguide. Water can then becirculated through the tubing to conduct heat away from the waveguide.

In the accompanying drawing forming a part of this specification, and inwhich like numerals are employed to designate corresponding partsthroughout the same:

FIGURE 1 is a side view of a conventional air cooled waveguide load;

FIGURE 2 is a side view of a waveguide load with water cooling meansaccording to applicants invention;

FIGURE 3 is an end view along line 3--3 of FIG- URE 2; and

FIGURE 4 is bottom view along line 4-4 of FIG- URE 2.

Referring now to FIGURE 1, a conventional air cooled waveguide load 1includes an aluminum body with a ceramic absorbing material 2 threin anda conventional connecting flange 3. To waveguide load 1, a copper or3,369,198 Patented Feb. 13,, 1968 "ice aluminum tube 5 (see FIGURES 2-4)is wound about bottom surface 7, end surface 9, and top surface 11 toprovide two U-shaped portions 13 and 15 that are interconnected byintermediate portion 17 and provided with supply and exhaust connections19, 21. Supply connection 19 has flare fitting 23 for connection to awater supply, and flare fitting 25 provides means for connecting exhaustconnection 21 to means for recirculating or exhausting circulated water.Copper or aluminum tube 5 is securely mounted to surfaces 7, 9 and 11such as by solder 27.

By providing tube 5 about the waveguide load as illustrated anddescribed, the output capabilities are multiplied while the temperatureof the waveguide load is maintained at a minimum for appropriate powerratings for the waveguide load.

It is to be understood that the form of our invention, herewith shownand described, is to be taken as a preferred example of the same, andthat various changes in the size, shape and arrangement of parts may beresorted to, without departing from the spirit of our invention, or thescope of the subjoined claim.

We claim:

1. A water cooled waveguide including: a waveguide body with tubingwound about three outer surfaces, two of which are flat and oppositeeach other and the other of which is an end surface which intersectssaid two surfaces, said tubing being wound about said surfaces in theform of two U-shaped portions with each U-shaped portion defining a baseand two legs and an intermediate tube portion interconnecting a leg ofeach of the U-shaped portions; means permanently securing said tubing tosaid outer surfaces for heat exchange relationship; and means atopposite ends of the tubing for connecting one end of the tubing to awater supply and for connecting the other end of the tubing to means forreceiving exhaust water.

References Cited UNITED STATES PATENTS 2,079,137 5/1937 Varian 313-222,648,047 8/ 1953 Hollingsworth 33322 2,669,696 t2/ 1954 Ward 333222,752,572 6/1956 Bird et al. 33322 2,908,875 10/1959 Blatt et al. 333223,030,592 5/ 1962 Lamb et a1 33322 3,147,451 9/ 1964 Merdinian 333223,280,360 10/1966 Frost et al. 31312 3,312,914 4/1967 Bolster 33322FOREIGN PATENTS 1,079,224 4/ 1960 Germany.

ELI LIEBERMAN, Primary Examiner.

R. HUNT, Assistant Examiner.

1. A WATER COOLED WAVEGUIDE INCLUDING: A WAVEGUIDE BODY WITH TUBINGWOUND ABOUT THREE OUTER SURFACES, TWO OF WHICH ARE FLAT AND OPPOSITEEACH OTHER AND THE OTHER OF WHICH IS AN END SURFACE WHICH INTERSECTSSAID TWO SURFACES, SAID TUBING BEING WOUND ABOUT SAID SURFACES IN THEFORM OF TWO U-SHAPED PORTIONS WITH EACH U-SHAPED PORTION DEFINING A BASEAND TWO LEGS AND AN INTERMEDIATE TUBE PORTION INTERCONNECTING A LEG OFEACH OF THE U-SHAPED PORTIONS; MEANS PERMANENTLY SECURING SAID TUBING TOSAID